In an animal experiment carried out by a professor in Tokyo U comparing the various health benefits of different fruits, using banana, grape, apple, water melon, pineapple, pear and persimmon, it was found that banana gave the best results. It increased the number of white blood cells, enhanced the immunity of the body and produced anti-cancer substance TNF.
The recommendation is to eat 1 to 2 bananas a day to increase your body immunity to diseases like cold, flu and others.